[Mikael Björnson]

Great! Thanks. I’m new to ray-tracing, having jumped from CS5 to CC. For this pretty basic shadowing effect, I don’t need it. It just freezes up my computer completely. Problem solved, many thanks!

[Mikael Björnson]

Sorry, I pasted the wrong link above. Unless you know italian, of course.
https://www.youtube.com/watch?v=2GAMk9cI45U

But that video only shows how you zoom between pictures from Google Earth. They have the very thing you’re looking for: identical vantage points and variable zoom of the same motif. If you want the effect to be as perfect and fluent as the video you pasted, then yes: you will have to shoot the pictures with the end result in mind as described above. Consider the perspective lines of the photographs in the video. They all align. This is the key to beautiful zoom endless zoom effects.

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[Mikael Björnson]

This video gives you the basic principles of zooming between stills. Hope it helps:
https://www.youtube.com/watch?v=zCFF9emjYFc

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[Mikael Björnson]

Yes, the raytracing quality was set to 2. I’m new to CC. What is a reasonable value to set? When I increase it to 10, my machine (a Macbook Pro 2.9 GHz with 8 GB RAM) freezes up. I suppose I’m doing something fundamentally wrong and need to go back to setttings?